Method for the ignition of blasting cartridges



March 11 1924. 1,486,492

A. MESSER METHOD FOR THE IGN ITION 0F BLASTING CARTRIDGES Filed Aug. 29.1921 Patented Mar. ll, 1924a snare METHOD FOR THE IGNITION E BLAS'IINGCARTRIDGES.

Application filed August 29, 1921.

Serial No. 469,758.

(GRANTED "UNDER THE PRQVISIONS 0F THE ACT OF MARCH 3, 1921, 41 STAT. L.,1313.)

To all whom it may concern:

Be it known that I, Anonr Mnssnn, a citizen of the German Republic,residing at Frankfort-on-the-Main; Germany, have invented certain newand useful Improvements in Methods for the Ignition of BlastingCartridges (for which I have filed an application in Germany August 16,1915),

of which the following is a specification. F or blasting with liquid airor liquid oxygen the priming of the explosive is prepared in such amanner that before the carbon cartridge or, if the charge consists ofseveral cartridges, one of said cartridges is dipped into the liquid airor into the liquid oxygen, the fuze or quick match with a priming cap isattached to said cartridge. There are mostly several cartridges in thedipping vessel at the same time and the quick matches of all thecartridges which are being soaked hang over the rim of the vessel. Whenopen lamps are used in the mines and also for many other reasons thereis always a great danger of premature ignition of the cartridges in thedipping vessel. 1

These dangers are removed according to this process in a very simplemanner.

A preferred form of apparatus by which the invention is carried intoefi'ect is illustrated in the accompanying drawing, wherein Fig. 1 showsthe application of the ignit ing method to a blast hole.

Fig. 2 shows on a larger scale than Fig. 1 the priming cartridge with afuze in side elevation partly in section.

A short carbon cartridge, a cartridge filled with any other combustiblesubstance, or a plug of incombustible material which may serve astamping is connected with the fuze or quick match which can have beenfitted previously with the primer. This priming cartridge or plug is notdipped into liquid air or liquid oxygen.

The carbon cartridges which have been impregnated with liquid air orwith liquid oxygen are, for safety against premature ignition, providedwith strings or cords which have been rendered incombustible. In orderto make the blasting charge ready one or several carbon cartridges p 10(Fig. 1) impregnated with liquid air or with liquid oxygen are insertedin the blast hole, whereupon a not impregnated priming cartridge 6 or aplug prepared for priming and finally the tamping d are inserted. Thepriming cartridge (Fig. 2) is pushed in close contact with theimpregnated carbon cartridges. Thispriming cartridge consists of thepriming plug a to which the fuze b of incombustible material is attachedand of wooden rollers e which serve to facilitate the insertion of thepriming plug into the blast hole and to ensure the accurate position ofthe same in front of the carbon cartridges 22 17 The fuze b has not beendipped into liquid air or liquid oxygen as stated above. The electriclead f (Fig. 1) is attached to the fuze b. The oxygen vapours which areproduced penetrate into the priming cartridge up to the ignition so thatthis priming cartridge is thoroughly impregnated with these vapours sothat this priming cartridge has been transformed before the primingtakes place, into a blasting cartridge and causes by its own rapidcombustion also a rapid combustion of the entire blasting charge.

When a priming plug is used which can serve at the same time for tampingthe blast hole the quick match or the priming cap are arranged so thatthey are in contact with the impregnated carbon cartridge whereby thesame is ignited.

I claim 1. An improved method for the making ready and for the ignitionof blasting cartridges of combustible material and liquid oxygen orliquid air consisting in inserting 0 the priming device into the blasthole with a separate support which is not impregnated instead of dippingthe same into the liquid together with the carbon cartridge in order toprevent premature ignition or inis-firing.

2. An improved method for the making ready and for the ignition ofblasting cartridges of combustible material and liquid oxygen or liquidair consisting in inserting the priming device into the blast hole witha separate support which consists of an incombustible substance and isnot impregnated instead of dipping the same into the 5 liquid togetherwith the carbon cartridge in order to prevent premature ignition ormishrmg.

ADOLF MESSER. Witnesses JAY BUEKERT, BERNHARD REUSER.

